IOTA/IOTA-ES occultation update for (1499) Pori / TYC 1724-00885-1 event on 2012 Sep 23, 07:29 UT Visible from W Canada, NW USA, Hawaii Summary ------- On 2012 Sep 23 UT, the 13 km diameter asteroid (1499) Pori will occult a 9.5 mag star in the constellation Pegasus for observers along a path across W Canada, NW USA, Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 14.2 mag (the magnitude of the asteroid) for at most 1.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 28 * date and approx. time of event: 2012 Sep 23, 07:19 - 2012 Sep 23, 07:39 UT * geocentric midpoint of event [JD]: 2456193.8120875 * magnitude of target star: 9.5 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 1.4 * Moon: 55 % sunlit, 86° distance * Sun: 162° distance * rough path description: W Canada, NW USA, Hawaii The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 2.41 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .055 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .056", .027", 75° ) * approx speed of asteroid's shadow [km/s]: 9.3860 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1724-00885-1 by 1499 Pori on 2012 Sep 23 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude 155 12 56 -13 0 0 7 39 36 2 71 -2 155 1 21 155 24 26 154 4 25 156 18 54 157 52 16 -12 0 0 7 39 34 5 70 -5 157 41 40 158 2 48 156 49 46 158 52 51 Latitude Latitude Latitude Latitude 158 0 0 -11 56 56 7 39 34 5 70 -5 -11 52 45 -12 1 7 -11 32 33 -12 21 14 159 0 0 -11 32 40 7 39 33 6 70 -6 -11 28 28 -11 36 52 -11 8 10 -11 57 5 160 0 0 -11 7 33 7 39 31 7 70 -7 -11 3 19 -11 11 46 -10 42 56 -11 32 4 161 0 0 -10 41 33 7 39 30 8 70 -8 -10 37 18 -10 45 48 -10 16 49 -11 6 12 162 0 0 -10 14 42 7 39 28 9 70 -9 -10 10 26 -10 18 57 - 9 49 50 -10 39 28 163 0 0 - 9 46 58 7 39 25 10 69 -10 - 9 42 41 - 9 51 15 - 9 21 58 -10 11 52 164 0 0 - 9 18 22 7 39 23 11 69 -11 - 9 14 3 - 9 22 40 - 8 53 14 - 9 43 24 165 0 0 - 8 48 53 7 39 20 12 69 -12 - 8 44 33 - 8 53 13 - 8 23 37 - 9 14 4 166 0 0 - 8 18 32 7 39 16 13 69 -13 - 8 14 10 - 8 22 53 - 7 53 7 - 8 43 51 167 0 0 - 7 47 17 7 39 13 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23 0 0 67 40 32 7 19 42 16 280 -1 67 44 37 67 36 28 68 4 16 67 16 54 - 22 0 0 67 33 5 7 19 40 15 281 0 67 37 10 67 29 0 67 56 54 67 9 21 Uncertainty in time = +/- 6 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 1724-00885-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 44 28.1468 DE: +18 08 39.425 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .018 ) * V mag [mag]: 9.5 * B mag [mag]: 9.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1499) Pori approx. diameter [km]: 13 approx. diameter ["]: .014 distance from Earth [AU]: 1.32400 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 918 number of rejected observations: 31 time covered by the observations: 1938 Oct 16 - 2012 Sep 04 1 sigma uncertainty ellipse (major, minor, PA): 0.052, 0.021, 73° remarks: * orbital elements for (1499) Pori : Mean anomaly = 33.82993955 deg Arg. of pericenter = 73.80375547 deg Long. of node = 239.85400422 deg Inclination = 12.20465636 deg Eccentricity = 0.18398594 Semimajor axis = 2.67001750 AU Perihelion dist = 2.17877182 AU Mag: H = 11.28, G = 0.15 Epoch of elements : MJD 56193.31200000 TDT (2012 Sep 23.312) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 23 1499 Pori 7h 29.4m UT 9.5 23 44 28.147 18 8 39.42TYC 1724-00885-1 9.9 14.2 13 1.4 1.324 -1.894 -22.59 -118.7878 18.151 65.72 -0.27 7.4901 -0.27755 0.33173 -4.06378 -3.39873 0.00045 -0.00167 2000 33.0817302012 920.00000 73.803755239.854004 12.2046560.18398594 2.6700175 2.178771811.2 5.00.15 RATE 2.2590870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.056 0.027 75 3.41 0.033 0 0-2 5 056178.0020120923_0885-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 23:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org